¹University of British Columbia, Division of Gastroenterology, Vancouver, Canada, ²University of British Columbia, PGA and Gi Research Institute, Vancouver, Canada, ³Hotel-Dieu of Levis, Department of Gastroenterology, Levis, Canada, ⁴University of Alberta, Department of Gastroenterology, Edmonton, Canada

¹University of Chicago Inflammatory Bowel Disease Center, Chicago, USA, ²Analysis Group, Inc., Boston, USA, ³AbbVie Inc., North Chicago, USA

¹Iuliu Hatieganu University of Medicine and Pharmacy, Gastroenterology and Hepatology, Cluj-Napoca, Romania, ²Regional Institute of Gastroenterology and Hepatology, Cluj-Napoca, Romania, ³Iuliu Hațieganu University of Medicine and Pharmacy, Department of Pharmaceutical Analysis, Faculty of Pharmacy, Cluj-Napoca, Romania, ⁴MedFuture Research Center for Advanced Medicine, Department of Proteomics and Metabolomics, Cluj-Napoca, Romania

¹Icahn School of Medicine at Mount Sinai, Genetics and Genomic Sciences, New York, USA, ²Icahn School of Medicine at Mount Sinai, Pathology, New York, USA, ³Icahn School of Medicine at Mount Sinai, Biostatistics, New York, USA, ⁴Icahn School of Medicine at Mount Sinai, Gastroenterology, New York, USA

¹Erasmus MC, Department of Gastroenterology and Hepatology, Rotterdam, The Netherlands, ²Amphia Hospital Breda Loc. Molengracht, Department of Internal Medicine and Gastroenterology, Breda, The Netherlands, ³Erasmus MC, Department of General Surgery, Rotterdam, The Netherlands

¹University Hospital Dubarava, Gastroenterology, Hepatology and Clinical Nutrition, Zagreb, Croatia, ²Ruder Boskovic Institute, Zagreb, Croatia, ³University Hospital Dubarava, Hematology, Zagreb, Croatia, ⁴Termomed, Zagreb, Croatia, ⁵University Hospital Center Zagreb, Urology, Zagreb, Croatia

¹Concord Repatriation General Hospital, Department of Gastroenterology, Sydney, Australia, ²Singapore General Hospital, Gastroenterology, Singapore, Singapore, ³St. Vincent's Hospital, Gastroenterology, Melbourne, Australia

¹Imperial College, Gastroenterology, Harrow, UK, ²St Mark's Hospital, Department of Gastroenterology, Harrow, UK, ³The Royal Bournemouth and Christchurch Hospitals, Department of Gastroenterology, Bournemouth, UK, ⁴University of Birmingham, Institute of translational medicine, Birmingham, UK, ⁵St Vincent Hospital Melbourne, Gastroenterology, Melbourne, Australia, ⁶Queen Alexandra Hospital, Gastroenterology, Portsmouth, UK, ⁷Guy’s & St Thomas’ NHS Foundation Trust, Gastroenterology, London, UK, ⁸St. Mark's Hospital, Histopathology, Harrow, UK

¹Algarve University Hospital Centre, Gastroenterology, Algarve, Portugal, ²Algarve Hospital Centre, Gastroenterology, Algarve, Portugal, ³Universidade do Algarve, Biomedical Science Department, Algarve, Portugal, ⁴Algarve University Hospital Center, Pathology, Algarve, Portugal, ⁵Health Community Centres Organization, Algarve, Portugal, ⁶Algarve University Hospital Center, Gastroenterology, Algarve, Portugal

¹Maastricht University Medical Center, Gastroenterology and Hepatology, Maastricht, The Netherlands, ²School for Nutrition, Toxicology and Metabolism (NUTRIM), Maastricht University Medical Center, The Netherlands

¹University Hospital Estaing, Gastroenterology Department, Clermont-Ferrand, France, ²UMR 1071 Inserm/Université d'Auvergne; USC-INRA 2018, Microbes, Intestine, Inflammation and Susceptibility of the Host, Clermont-Ferrand, France, ³University Hospital, Gastroenterology Department, Amiens, France, ⁴Archet 2 University Hospital, Department of Gastroenterology, Nice, France, ⁵University Hospital, Gastroenterology Department, Lille, France, ⁶Hospices Civils de Lyon, Lyon-Sud hospital, Gastroenterology, Pierre Benite, France, ⁷University Hospital G. Montpied, Biochemistry Laboratory, Clermont-Ferrand, France, ⁸CHU Nancy Brabois, Department of Gastroenterology, Vandoeuvre les Nancy, France, ⁹University Hospital of Saint Antoine, APHP, Gastroenterology, Paris, France, ¹⁰APHP, Hopital Saint Louis, Department of Gastroenterology, Paris, France, ¹¹University Hospital, Biostatistics Unit, DRCI, Clermont-Ferrand, France, ¹²Amiens University Hospital, Gastroenterology, Amiens, France, ¹³University hospital of Lille, Gastroenterology, Lille, France

¹Bispebjerg Hospital, Digestive Disease Center, Copenhagen, Denmark, ²University of Manchester, Wellcome Trust Centre for Cell-Matrix Research, Manchester, UK, ³Herlev Hospital, Department of Pathology, Copenhagen, Denmark, ⁴University of Copenhagen, NFF Center of Basic Metabolic Research, Copenhagen, Denmark, ⁵Institute of Clinical Physiology, Charité, Berlin, Germany, ⁶University of Copenhagen, Department of Biomedical Sciences, Copenhagen, Denmark

¹Hospital Santa Maria, Gastrenterology, Lisbon, Portugal, ²Hospital Santo António, Gastrenterology, Porto, Portugal

¹National and Kapodistrian University of Athens, Laiko General Hospital, Academic Department of Gastroenterology, Athens, Greece, ²National and Kapodistrian University of Athens, First Department of Pathology, Athens, Greece, ³on behalf of the Greek Vedolizumab Study group, Athens, Greece

Inje University College of Medicine, Internal Medicine, Seoul, South Korea

¹Academic Medical Center (AMC), Department of Gastroenterology and Hepatology, Amsterdam, The Netherlands, ²Academic Medical Center (AMC), Department of Surgery, Amsterdam, The Netherlands ¹

Sant'Orsola - Malpighi Hospital, Alma Mater Studiorum University of Bologna, Surgery of the Alimentary Tract, Department of Medical and Surgical Sciences, Bologna, Italy, ²Sant'Orsola - Malpighi Hospital, Alma Mater Studiorum University of Bologna, IBD Unit, Department of Medical and Surgical Sciences, Bologna, Italy

¹Oxford University Hospitals (OUH), Department of Gastroenterology, Oxford, UK, ²Oxford University Hospitals (OUH), Department of Obstetrics and Gynaecology, Oxford, UK, ³Oxford University Hospitals (OUH), Nuffield Department of Medicine, Oxford, UK

Toho University Sakura Medical Centre, Division of Gastroenterology and Hepatology, Department of Internal Medicine, Sakura, Japan